My baby is formula fed (9 weeks old) - everywhere states she should be drinking 5oz bottles however she will only drink 2-3 oz.. every 3 hours. I'm so worried she's not getting enough, has anyone had any similar experience? If I try to persist she pulls off the bottle and cries.. she winds well and is on lactose free milk to see if it was an intolerance but I've seen no improvement and she's been on this new milk for a week now.